PI7C9X754FCEX - 4-Channel UART Controller | Diodes Incorporated
MPN： PI7C9X754FCEX ✓ 啟用中PI7C9X754FCEX 概覽
A UART is a Universal Asynchronous Receiver/Transmitter, a serial-interface controller that converts parallel data from a processor into framed serial transmissions and converts received serial data into parallel data. The PI7C9X754 belongs to the broader hierarchy of interface controllers, communication ICs, and semiconductors. Its four independent channels let one controller manage multiple serial links while sharing a host data bus and interrupt interface.
The PI7C9X754FCEX uses 16C550-compatible registers, giving firmware a familiar programming model. Each UART includes 64-byte transmit and receive FIFOs, FIFO level counters, and programmable transmit and receive trigger levels. Those trigger levels support interrupt-driven transfers or DMA operation, reducing the need for the host processor to service every received byte individually.
The controller supports both Intel and Motorola data-bus interfaces, allowing it to operate with processors using either timing convention. It also provides automatic wake-up following a sleep mode, making it useful in systems that periodically suspend peripheral activity to reduce power consumption. Its 1.62 V to 3.6 V operating range supports low-voltage embedded systems while the 5 V-tolerant serial inputs broaden interface flexibility.
Typical uses include industrial control panels, multiport data acquisition systems, instrument controllers, embedded test equipment, and communications modules requiring several UART channels. The device is particularly suitable when one processor must service multiple RS485, RS232, IrDA, or other serial links while maintaining orderly FIFO flow control and interrupt handling.
PCB design should preserve the manufacturer's recommended power and ground layout, place decoupling capacitors close to the supply pins, and provide clean high-speed digital routing. The UART is a digital interface IC rather than a power semiconductor, so thermal operating considerations are centered on supply dissipation and signal integrity rather than a safe operating area graph.
This product page organizes the controller's core electrical characteristics, interface functions, application guidance, and practical design considerations into one engineering reference. It also clarifies the distinctions among FIFO behavior, bus compatibility, low-voltage operation, and 5 V-tolerant inputs when evaluating this device for a new multi-channel serial design.
直接替換替代品，適用於 PI7C9X754FCEX — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
此產品無可直接替換的替代品。
申請替代品PI7C9X754FCEX 最大額定值與電氣特性
| Product Type | Quad UART controller |
| Number of UART Channels | 4 channels |
| Core Supply Voltage Range | 1.62 V to 3.6 V |
| Serial Input Tolerance | 5 V tolerant |
| Transmit FIFO Depth | 64 bytes per UART |
| Receive FIFO Depth | 64 bytes per UART |
| Register Compatibility | 16C550-compatible register set |
| Host Data Bus Interface | Intel or Motorola selectable |
| Transfer Triggering | Programmable TX and RX FIFO trigger levels |
| FIFO Level Counter | Transmit and receive |
| Processor Transfer Support | DMA and interrupt |
| Low-Power Mode | Programmable sleep mode with automatic wake-up |
| IrDA Support | IrDA 1.1 |
| RS485 Controller Support | Yes |
| 封裝 | 64-LQFP, 10 mm x 10 mm |
| 安裝類型 | Surface mount |
PI7C9X754FCEX 64-lqfp, 10 mm x 10 mm 腳位配置指南
PI7C9X754FCEX（64-lqfp, 10 mm x 10 mm 封裝）的腳位配置。 此功率元件具有閘極、汲極與源極端子。對於非極性封裝，請參閱製造商資料表以取得確切的第 1 腳方向與佈局詳細資訊。常見應用包括電源設計、馬達驅動與負載切換。
無詳細腳位定義資料： PI7C9X754FCEX.
請參閱 資料表 以查看完整腳位配置。
典型應用
PI7C9X754FCEX 適用於 6 應用s: Industrial Serial Control Panels, RS485 Multiport Data Acquisition, Embedded Test and Measurement Equipment, Low-Power Embedded Communications Modules, IrDA-Enabled Portable Devices, Interface Expanders for Processor Boards.
Industrial Serial Control Panels
The PI7C9X754FCEX suits industrial control panels that must connect several embedded peripherals to one host processor. Four independent UART channels provide separate baud-rate and framing configurations, while each 64-byte FIFO helps absorb bursts from sensors, scanners, and operator terminals. According to the manufacturer datasheet, programmable TX and RX trigger levels support both interrupt and DMA operation. Designers can therefore reserve processor time for control logic while the controller manages buffered serial traffic. The 1.62 V to 3.6 V core range fits low-voltage embedded processors, and 5 V-tolerant serial inputs broaden compatibility with qualified peripheral logic. External RS485 transceivers or protection networks remain necessary when the panel connects to long-distance, noise-prone industrial buses.
RS485 Multiport Data Acquisition
The PI7C9X754FCEX is appropriate for multiport data-acquisition equipment requiring several RS485-facing UART links. Each of its four UART channels includes a 64-byte receive FIFO, a transmit FIFO, and independent level counters, allowing the host to service channels according to buffered activity instead of polling every port continuously. According to the manufacturer datasheet, selectable Intel or Motorola host-bus timing supports different processor interfaces, while programmable trigger points support DMA and interrupt transfers. In an acquisition system, the IC can receive commands on one channel and collect sensor data on others. Appropriate external RS485 transceivers, isolation, surge protection, and termination must be selected for the installation environment.
Embedded Test and Measurement Equipment
The PI7C9X754FCEX can consolidate host-controlled serial links in embedded test and measurement equipment. Four UART channels allow a single controller to connect instruments, fixtures, and service interfaces without requiring four independent bridge devices. According to the manufacturer datasheet, every channel has independent FIFO resources and a 16C550-compatible register set, while the host can choose interrupt or DMA transfer handling. The 64-byte FIFOs are particularly useful when peripheral responses arrive in short bursts or when firmware must coordinate several instruments. Its 1.62 V to 3.6 V core operation supports embedded logic rails, and 5 V-tolerant serial inputs assist integration with appropriately specified peripheral interfaces. Signal amplitudes and isolation must still be checked at the board level.
Low-Power Embedded Communications Modules
The PI7C9X754FCEX fits communications modules that periodically suspend activity but need to resume serial exchanges without reinitializing every peripheral. According to the manufacturer datasheet, each UART is independently controlled, supports a programmable sleep mode, and can wake automatically. A host processor can leave unused channels asleep while keeping an active channel responsive, helping reduce unnecessary processor wake-ups and peripheral activity. The four-channel configuration supports gateways, local controllers, and compact communications hubs with multiple links. The 1.62 V to 3.6 V supply range is useful for low-voltage embedded designs, while 5 V-tolerant serial inputs improve integration flexibility. Wake sources, reset behavior, and required external level shifters should be reviewed in the system timing design.
IrDA-Enabled Portable Devices
The PI7C9X754FCEX can support portable or short-range products that need IrDA 1.1 alongside conventional serial channels. According to the manufacturer datasheet, the controller supports IrDA 1.1 and four independently controlled UARTs with 64-byte FIFOs. This allows an IrDA link and other UART-based sensors or accessories to share one interface IC while retaining separate channel configuration. The low 1.62 V minimum core supply is favorable for battery-powered embedded logic, and the automatic wake-up function can complement a system that periodically disables communication hardware. IrDA operation also depends on correct optical or transceiver circuitry, baud timing, and transceiver enable sequencing; the UART controller alone does not provide the physical infrared link.
Interface Expanders for Processor Boards
The PI7C9X754FCEX provides a practical way to expand serial I/O on a processor-centric board that has reached the practical limit of its built-in UART channels. Four channels with independent registers and FIFOs preserve separate logical ports for debug, configuration, peripherals, and external equipment. According to the manufacturer datasheet, Intel or Motorola host-bus selection improves processor-platform flexibility, while DMA and interrupt support allow efficient transfer management. The interface IC can operate from a 1.62 V to 3.6 V core rail and accept 5 V-tolerant serial inputs under the specified conditions. Pin assignment, interrupt priority, DMA handshaking, and level translation must be validated against the host processor and the complete system clocking arrangement.
工程參考資料，適用於 PI7C9X754FCEX — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 |
|---|---|
| Product Type | Quad UART controller |
| Brand | Diodes Incorporated |
| Package | 64-LQFP, 10 mm x 10 mm |
| Number of UART Channels | 4 channels |
| Core Supply Voltage Range | 1.62 V to 3.6 V |
| Serial Input Tolerance | 5 V tolerant |
| Transmit FIFO Depth | 64 bytes per UART |
| Receive FIFO Depth | 64 bytes per UART |
| Register Set | 16C550-compatible |
| Host Bus Interface | Intel or Motorola selectable |
| Transfer Support | DMA and interrupt |
| Low-Power Operation | Programmable sleep mode with automatic wake-up |
設計說明
Use the manufacturer datasheet's pin-description table and package drawing before assigning tracks. Keep the UART clock and host-bus signals away from noisy switching nodes, provide a continuous ground reference beneath the device, and place required bypass capacitors close to their supply pins. The 64-LQFP footprint is compact, but lead spacing and fanout should be checked against the PCB fabrication capability rather than estimated from the 10 mm x 10 mm body size.
Treat the host clock, read and write strobes, interrupt, DMA request, and DMA acknowledge as a coordinated digital interface. Use short, topology-controlled routes, avoid unnecessary stubs, and confirm signal levels against the 1.62 V to 3.6 V core range. Although serial inputs are 5 V tolerant, tolerance does not eliminate timing, ringing, or logic-level budget issues. Validate the final layout with an eye diagram or equivalent measurements at the intended clock rate.
Do not assume that the 5 V-tolerant serial inputs permit 5 V core operation or remove the need for level translation elsewhere. Configure the Intel or Motorola host-bus selection correctly, establish the reset state before enabling host access, and program FIFO trigger levels only after each channel's operating mode is known. A mismatch between bus convention and firmware assumptions can produce intermittent reads even when the serial channels themselves are functioning normally.
Power the controller from a rail inside the specified 1.62 V to 3.6 V range and apply decoupling according to the manufacturer datasheet. Separate noisy digital activity from sensitive analog sections elsewhere on the board, and provide return paths for switching peripherals so their current does not flow through the UART ground region. Because the controller is a digital interface IC, thermal analysis should use actual supply current and board-level heat spreading rather than a power-semiconductor safe operating area calculation.
合規資訊
No explicit RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals statement was identified for this exact ordering code.
